I follow your instruction as below:
- Go to Blogger Dashboard > Template > Edit HTML
- Click on "Revert widget templates to default" button, appears in right mid
- A window will open, check the box of "Blog1"
- Now click on "Revert Selected Widget" appears in orange color.
But this message appear:
"Editing your theme so it mixes HTTP and HTTPS may affect the security and user experience of your blog when it is viewed over HTTPS"
Still cannot read the comments in my blog.